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Some of /Library may not be copyable (or replaceable) due to SIP. And if you do copy back files, you might inadvertently overwrite files that needed to change in the update. A better approach would be a TM backup → erase → install → use migration assistant to restore account and settings from backup.


Yes, a copy of /Library and ~/. (which includes ~/Library) will retain most of your personalised settings. You may want to also include /Users/Shared as it is used by a few apps (e.g. from Adobe) to store licences and/or settings. But the copy will include much of your clutter and history. This will defeat the purpose of a 'clean' install. A clean install ...


At least one of OWC's 2 TB SSD is compatible with OS 10.13 and later. From the page for the OWC Aura Pro X2 SSD for the 2013-2015 Retina MBP: "Aura Pro X2 is designed for the latest macOS versions (macOS High Sierra 10.13 and later), taking full advantage of the advanced features of APFS including: strong encryption, copy-on-write metadata, space ...


The answer used to be to first upgrade to High Sierra. The reason was High Sierra included the firmware upgrade to allow a Mac to boot from APFS volumes. Also, if your Mac boots from a SSD, then the upgrade would convert the boot volume to APFS. I can refer to this previous question: Updating to macOS Catalina gets stuck, when trying to update from OS X ...


The iPad 4 can only be upgraded up to iOS 10.3.4, it will not show an option to upgrade to iOS 11 or later.

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